[Brightcolours]

What the 77D has over the 800D:

• 7650-pixel RGB + IR meterting sensor similar to that of the 80D
  
• Anti-flicker shooting mode for artificial light situations
  
• Top LCD display
  
• Quick control dial
  
• Lock switch
  
• AF focus button on back to separate focus and shutter control
  

For a pentaprism, look at the heavier 80D.